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Related Experiment Videos

Release and retention in Alpine ski bindings.

U Lindsjö, H Ekström, J Gustavsson

    International Journal of Sports Medicine
    |May 1, 1983
    PubMed
    Summary
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    Alpine ski binding release forces were tested in various directions. Oblique release forces were lower in some designs, highlighting the need to consider these forces for injury prevention.

    Area of Science:

    • Biomechanics and Sports Engineering
    • Orthopedic Injury Prevention

    Background:

    • Alpine ski bindings are critical safety devices designed to release during falls, preventing lower extremity injuries.
    • Understanding the forces involved in binding release, particularly in non-perpendicular directions, is essential for optimizing safety.
    • Previous research has primarily focused on perpendicular release forces, potentially overlooking crucial oblique release characteristics.

    Purpose of the Study:

    • To compare the release forces of six different alpine ski binding designs under semistatic loading conditions.
    • To investigate the differences in release forces when measured perpendicularly versus obliquely (30 degrees backward and forward).
    • To assess the implications of oblique release forces for preventing ski-related lower extremity injuries.

    Main Methods:

    Related Experiment Videos

    • Six alpine ski binding designs were subjected to semistatic testing using a materials testing machine (MTS).
    • Release forces were measured at the toe and heel components.
    • Measurements were taken perpendicularly, and at 30 degrees backward and 30 degrees forward relative to the ski's normal plane.

    Main Results:

    • In conventional two-part bindings, no significant difference was found between release forces in perpendicular and oblique planes.
    • Two binding designs featuring a spring-loaded, movable toe unit (Besser, "Jack" prototype) exhibited lower release resistance in oblique directions compared to perpendicular forces.
    • A lower release resistance in the obliquely forward direction was observed in specific designs.

    Conclusions:

    • The study indicates that release resistance in oblique planes can be lower than perpendicular forces in certain alpine ski binding designs.
    • The findings emphasize the importance of considering oblique release forces when evaluating the injury-preventing capabilities of ski bindings.
    • Future binding designs should aim to optimize release characteristics across various force vectors, particularly in the obliquely forward direction, to enhance skier safety and reduce lower extremity injuries.